Telegraph distribution system



Sept. 14, 1926. I 1,599,51

A. F CONNERY TELEGRAPH DISTRIBUTION SYSTEII Filed Nov. 6, 192 5 ZEW, M MZ c1 c2 "c3 INVENTOR ATTORNEY Patented 'fiept. l4, i926.

ALDER F. CONNERY, 0F JAMAICA, NEW YORK, ASSIGNOR TO POSTAL TELEGRAPH- CABLE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF CONNECTICUT.-

I TELEGRAPH DISTRIBUTION SYSTEIVL v Application filed November 6, 1925. Serial No. 67,216.

This invention relates to improvements in systems of telegraph distribution and ertains particularly to multi-channel print ing telegraph systems in which the multiplexing is attained by division of line time among the several channels and more particularly to systems which permit certain channels to be terminated at an intermediate point and other channels to'be repeated. Such systems are often referred to as series circuits. y

In vol. 54, No. 256 of The Journal of The Institution of Electrical Engineers, London,

England, such series circuits have been described by H. H. Harrison. In the system therein described the repeating of cer tain channels is accomplished by storing up, during one portion of the cycle ofopernel and therefore does not require a plunecessity of resetting the relays after the transmission of the stored signals.

My invention is an improvement over the system's just described in that it does not store up the several impulses of each chanrality of storage relays, thus accomplishing a reduction in relays and a consequent. simplification of apparatus.

My invention also makes it possible to cut through, by means of a simple switch, the channels which are ordinarily terminated at the intermediate station, the value of this novel feature in meeting changing telegraph traflic conditions is obviously very great. p

i The particular embodiment of the invention here described contemplates'the use of the five-unit Baudot code, the employment of automatic transmission by erforat'ed tape and'the use of rotary distributors of the cam type. This invention, however, may be used to advantagein connection with any e ual-letter code and with means of transmission other than by tape and is also suitable for use in connection with rotary distributors of the brush and segment type.

In order to more fully describe myinspecification, and which shows diagrammatically the circuits of the intermediate station of a series circuit wherein one channel is dropped at the intermediate station and the other channel is repeated. It should be understood that the invention will give many circuit combinations in addition to the drop 1, repeat 1, circuit described hereln, when suitable distributors are used.

There is shown in the drawing the essen tial apparatus at an intermediate station on i a series circuit. Only the apparatus necessary for one operation in one direction, east to west for example, is shown. When the lines are duplexed, as is usual, additional similar apparatus and balancing equipment will be required for the west to east operation, as is obvious.

Referring now to the drawing the dis; tributor comprises a plurality of cams; C, C to G, which with regard to their angular relation to each other are fixed and.

rotate upon a common shaft S The depressions shown u on these cams cause certain contacts to c ose during definite portions of the cycle of the cams revolution. The cam shaft is driven by a phonic or other type of motor and is kept in. synchronism and proper phase relation with the transmitter at the distant station by a synchronizing apparatus not shown. Syncronizing systems for continuously rotating distributol's as used in'printing telegraphy are well shown in the art and need not be described here. RR represents the receiving relay which is controlled by impulses transmitted over line LE from a distant station. TRrepresents. the transmitting relay adapted to send impulses over line LW to an-' other distant station. M to M represent the operating magnets-in the-local receiver printer or recorder. T to T represent the contacts on the local transmitter. The posisitions of these contacts are controlled by a perforated tapewhich is not shown as such control is obvious. W is the operating winding of the transmitting relay T-R. The cam Chas 10 short depressions and detersent to the winding W of relay TR. The

. cams C to G each have one short depres- -mines the time and duration of impulses received by relay RR, to the magnets M M M M andM.

In the drawing the cams are shown in the position where the local channel is being received, and cam C lias just closed its contacts and completed the circuit to printer connected from M to M through the me dium of cams C to C and the magnets are operated or not operated according to the position of T as the successive -cam contacts close. In this manner the signals received on relay RR will set up the proper combination on the printer magnets and the recording of the received message is then elfected, an operation common in the art.

It should be noted that cams G and C3, C and C, C and C, C and C1 andjC and C close simultaneously. The contacts in connection with cams C to C close the circuits from the tongues of the tape transmitter T to T through switch SW and master transmitting cam C to the winding W of relay TR and thence to the junction points of resistances R and R to cause the operation of tongue T to connect either generator G or G to the outgoing line LW to send impulses of desired polarity to the distant station, It should be noted that the length of depressions in cams C to C are longer and overlap depressions on cam C,

and therefore cam G determines the exact instant when windin W is energized, and also the duration 0 such energization it maybe said therefor to be a regenerator of impulses. The direction of 'the current through winding W will naturally be dependent upon the positions of the tape transmitter tongues T and T, as determined by the perforations in the message tape. .It will be seen that during one half .of the revolution of the distributors the reception of impulses on printer magnets M to M is simultaneous with'the potential transmission of impulses from the local transmitter to winding W thus the local transmitter may be used to transmit 'messages through relay TR to LW during this time interval.

During the other half of the revolution, cams G to O and G to C do not close their contacts and the local printer and tape transmitter is not during this time interval operated but it will be seen that cam C will be closed during this half cycle and the Winding W of relay TR will be connected to the tongue T of relay RR through thecontacts in connection with C and therefore any signals received'on receiving relay RR Wlll be repeated to winding of transmitting relay TR but will be regenerated in form through the medium of cam C". It 1 s evident that when lever L is thrown tothe left the circuit to the magnets M to M is opened and that no printing can take place. When lever L is thrown to the left the circuit to relay TR through cam C? isconnected directly to tongue 'I of the repeated. It is an advantage to have the depressions of cam C? as short as posible so that a minimum amount of the received signal will be ut lized and" thereby permit of regenerating very badly distorted received signals To insure that the tongue of the transmitting relay TR is held fi mly against one or the other of-its contacts during the pe-- riodof no current in the winding W, a leak from T v through winding W and then throughresistance R to ground has been provided. The direction of flow of the current in this winding W alwaysftends to hold thetongue T against whichever contact it maybe resting. The steady current flowing through W will be much less than the momentary current through W and it therefore will not interfere with the proper operating of the relay by the winding W WhileI have shown my invention as applied to'wiretelegra h systems, it is obvious that it is not limite to such use, but may be a plied to carrier current, or radio telegrap systems.

What is claimed is:

1.- In a telegraph distribution system, a receiving relay, a transmitting relay, a local receiver, a local transmitter, means whereby impulses from said receiving relay are for one interval of time distributed directly to said receiver, and means whereby receiving relay RR and all signals will be during the same time interval said local transmitter is co-functionally associated with said transmitting relay, and whereby during the next successive time interval impulses are transmitted directly from said receiving relay to said transmitting relay.

2. In a telegraph distribution system, a receiving relay, a transmitting relay, a lo cal receiver, a local transmitter, an impulse regenerating means, means whereby im- 7 time interval distribute 1,599,514 tlt pulses from said reoeivin relay are for one receiver, means whereby said local transmitter is during the same time interval cofunctionally associated with said transmitting relay, and whereby impulses are during a subsequent time interval distributed after passage through said regenerating means directlyto said transmitting relay.

3. In a telegraph distribution system, a receiving relay, a transmitting relay, a local receiver, a local transmitter, an impulse regenerating means, means whereby during one time interval impulses from said receiving relay may be distributed directly to said local receiver, means whereby during the same time interval said local'transmitter is co-functior-ally associated with said transmitting relay, and whereby impulses from. said receiving relay are distributed after passage through said regenerating means directly to said transmitting relay during a subsequent time interval.

4:. In a telegraph distribution system, a receiving relay, a transmitting relay,a local recorder, a local transmitter, an impulse regenerator, means whereby impulses from said receiving relay are for one time interval distributed directly to said recorder, means whereby during the same interval of time said'local transmitter is (in-functionally associated with said transmitting relay and whereby during the next successive time in.-

terval, impulses are, after traversing said' regenerator, distributed directly from said directly to said receiving relay to said transmitting relay.

5. In a telegraph distribution system, a receiving relay, a transmitting relay, a local receiyer, a local transmitter, 'an impulse regenerator, means whereby impulses, from said receiving relay are for one time interval distributed directly to said receiver, means whereby said local transmitter is during the same time interval co-functionallys related through said regenerator' with said transmitting relay and whereby impulses are during a subsequent time interval distributed atter passing' 'through said regenerator directly to said transmitting relay.

6. In a telegraph distribution system, a receiving relay, a transmitting relay, a local printer, a local. transmitter, an impulse regenerator, means whereby'impulses from said'receivingrelay are for one time interval distributed directly to said printer,

transmitting relay during both of said time intervals.

ALDER it coma ar. 

